We made BT ER Tool holder about 6year experience, we had precision projector to keep sure the taper are accuracy match BT taper and also we did 100% QC work for each holder. We have series BT toolholder such as BT30, BT40, BT50 and SK40 DIN69871; DAT too, Our precision reach from 0.003 to 0.015mm. By the future balance has G2.5(30, 000rpm) and also has without future balance available. For more information about ER toollholder please email us.